引用别人的博客：
http://blog.csdn.net/_/article/details/
http://www.cnblogs.com/milkmap/p/3766153.html
http://www.mamicode.com/info-detail-1215824.html
主要实现函数：
function getBoundary() {
var bdary = new BMap.Boundary();
bdary.get(two, function (rs) { //获取行政区域
var count = rs.boundaries.length; //行政区域的点有多少个
var pointArray = [];
for (var i = 0; i < count; i++) {
var ply = new BMap.Polygon(rs.boundaries[i], { strokeWeight: 2, strokeColor: “#ff0000” }); //建立多边形覆物
map.addOverlay(ply); //添加覆盖物
pointArray = pointArray.concat(ply.getPath());
}
});
}
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